A Strategy for Synthesizing CaZnOS:Eu2+ Phosphor and Comparison of Optical Properties with CaS:Eu2+

The red-emitting phosphor CaZnOS:Eu 2+ was synthesized from CaCO 3 , ZnS, Eu 2 O 3 and CeCl 3 by controlling the sintering condition. It was found that Ce 3+ ions can play a role of reductant to contribute to the formation of Eu 2+ in CaZnOS matrix under inert protective atmosphere. While the gas flow changed to H 2 /N 2 , the product turned to CaS easily. XRD, photoluminescence spectra, UV–vis and IR absorption spectra were evaluated to investigate the origin of the distinctions of the optical properties and stabilities between the two divalent europium ions doped phosphors CaZnOS:Eu 2+ and CaS:Eu 2+ . The similarities and differences between them were analyzed.